Core-barrel



(NoModel.)

J. V. SMITH.

GORE BARREL.

Patented Jan. 3, 1893.

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JOHN VALENTINE SMITH, OF RESERVE, ASSIGNOR OF ONE-HALF TO JOHN C.PORTER, JR., OF ALLEGI-IENY, PENNSYLVANIA.

CORE-BARREL..

SPECIFICATION forming part of Letters Patent No. 489,188? dated January3, 1893. Application led January '7, 1892. Serial No. 417,264. (Nomodel.)

To @ZZ whom t may concern:

Be it known that I, JOHN VALENTINE SMITH, a resident of Reservetownship, in the county of Allegheny and State of Pennsylvania, haveinvented a new and useful Improvement in Core-Barrels; andI do herebydeclare the following to be a full, clear, and exact descriptionthereof.

My invention relates to core barrels, its object being to provide a corebarrel for use in connection with the making of green sand cores forlarge hollow cylindrical castings, such as air chambers, reservoirs,dac., in which are formed end openings that are materially less indiameter than the body ot' the casting.

Another object of my invention is to provide a core-barrel which can beeasily vented and one in which the parts composing the same can beeasily taken apart and readily taken out from the interior of thecasting as soon as it is formed.

To these ends my invention comprises, generally stated, a hollow barwith openings therein for venting the same, and placing around the sameone or more supports or braces, said supports or braces being semi-cincularin form and having Wedges thereon for engaging with said hollow barto hold the same in position.

It also consists in certain improvements in these parts which will bemore fully hereinafter set forth and claimed.

To enable others skilled in the art to make and use my invention, I willdescribe the same more fully referring to the accompanying drawings inwhich Figure l is a perspective view of my improved core-barrel; Fig. 2is a sectional View of a mold ready for casting, showing some of theparts in full lines, and Fig. 3 is a detail view of oneend of thecylindrical casting showing therein one of the supports or braces readyto be taken out.

Like letters indicate like parts in each of the gures of the drawings.

I have shown my improved core-barrel in connection with the casting ofair chambers or reservoirs, though it may be used with the making of anyother kind of cylindrical castings requiring large cores and whose endsare contracted in order to form openings which are smaller than the mainbody of the casting. Around the hollow barA I place the supports orbraces l), there being generally two of these supports or bracesemployed in the castings above described, one at or near each endthereof, although any number can be used, three being shown in Fig. l.The supports or braces h have the bearings c which tit loosely aroundthe hollow bar A so that they can be adjusted to place, while extendingout from the bearings c are the arms d for supporting the semi-circularbars e at their outer ends, said sen1icircnlar bars e being preferablywith the lugs or projectionsfon each side thereof in order to take intothe sand composing the core and give stronger and better supportthereto. Hinged at g in bearings 7i on :said arms d are the wedges iwhich engage with the hollow bar A atj and so lock the supports orbraces b thereto.

At one end of the hollow bar A is the fixed head a, while at theopposite end of said hollow bar A is the removable head a which has theprojection a? fitting into the interior of said hollow bar. Theremovable head a has also the openings a3 for the insertion ofa bar toassist in carrying it, or moving it around while in the mold. Theseheads o. a enable the flask 7o containing the mold k to titaround thesame through the medium ofthe openings Z in the cope n and the openingsm in the drag o, as is shown in Fig. 2.

In order to vent the hollow bar A, a number of small holes orperforations p are bored or formed therein, so permitting the gases toenter the interior of the hollow bar and escape through the opening a*during the casting operation. In case it is desired to vent the hollowbar A at both ends, another hole a5 can be made in the removable head aeX- tending through the projection a? into the hollow portion as thenceto the open air. In order to further assist in bracing and supportingthe core-barrel, a horizontal brace q may be connected with the supportsor braces h by resting on top of the semi-circular bars e, saidhorizontal brace having the projections r extending down from the bottomthereof into the sand composing the core.

For the purpose of forming the core, the coro-barrel is then placed inthe core-box, the

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sandscomposingthe core is compacted around the same and around thesupport-s, and extends out at each end, as at t, around the hollow bar Auntil the fixed and removable heads a, a', are reached corresponding indiameter to said heads a', a2, and so forming the size of the openingsu, u required for the ends of the casting c afterward formed. Thesecastings have the iiange end lu and the round end v2, the round end c2materially aiding and enabling the operator to take out some of theparts composing the core-barrel from the interior of the casting, ashereinafter described.

The operation and use of myimproved corebarrel are as follows:-Thcsupports or braces b are first placed around the hollow barA by means ofthe bearings c and adjusted to the desired distance apart, when by meansof the wedges Il coming in contact with the hollow bar A they are firmlyheld in place, the corebarrel is then placed in a core box, the insideof which is of the shape of the interior and slightly smaller than thecasting to be formed, and the horizontal brace q laid upon the top ofthe semi-circular bars c of the supports or braces b which are hung fromthe hollow bar A and extend down near the bottom of the core, the top ofthe core requiringlittle or no' support, being supported by the hollowbar A and the sand supported by the supports or braces 1),'. sand isthen fed thereto and the core duly formed, after which the core-barrelwith its core is then taken out of the core box and put into the ask lc,the outside circumference of the mold having been previously formedtherein, the part or side of the core barrel containing` the supports orbraces b being toward the bottom of the ask 7c,the fixed head ct andremovable head a of the hollow bar A resting in the openings m in thedrag o. Thecope nis then placedthereomthe openings Z of which tit aroundthe fixed and removable heads a,a;the mold is then ready for the pouringof the molten metal into the same, the gases generated in casting passthrough the openings p into the hollow bar A and escape through theopenings a4, a5, in the fixed head a, thereby providing a core-barrelwhich will ventitself during the casting operation. After the mold hasbecome sufiiciently cooled to permit handling, the cope n; and drag o ofthe flask 7c are then taken away, and the casting put upon its end, sothat the sand contained therein will be forced out through the endopeningu of the casting when the operator by means of a hammer or othersuitable instrument strikes the blows against the removable head a orthe free end of the hollow bar A, so forcing said hollow bar out throughthe casting and, at the same time, releasing the wedges t from contactwith the hollow bar A, and thus allowing the supports or braces b tofree themselves from the hollow barA and so drop into the bottom of theinterior of the casting. After all the sand has been taken out of thecasting, the operator turns the casting on its end and shakes or rattlesthe same until the end of the horizontal brace q gets near or protrudesthrough the end opening u of the casting, when it is withdrawn therefromafter the hollow bar A and sand have been taken out or with the-sandfrom the interior of the casting. In order to get out the supports orbraces b from the inside of the casting, all that is necessary is toturn the casting up on its end and shake or rattle the same until one ofthe supports or braces b gets near the lower end of the casting, or itsend protrudes through the end opening u when the operator, by catchinghold of the protruding end, can easily withdraw the support or brace bout of the casting c in a circular line, and the round end c2 of thecasting c allowing the support or brace b to pass around the casting/0untilthe bearing c reaches the opening u', which, being larger than thebearing c, allows it to come out so that the whole support or brace l)can be withdrawn from the interior of the casting c, as shownin Fig. 3.The other supports or bracesbcan be withdrawn in the same manner. Itwillthus be seen that my improved core-barrel will vent itself, therebyovercoming the objection heretofore found in having to make openings forthe gases to escape after the molding operation. It can be easilyoperated and renders excellent support to the core so that there is noliability ofthe corebarrel breaking down as the struct-ure is strong anddurable in its parts, very inexpensive, and can be easily separated andtaken apart and all its parts removed from the interior of the castingthrough a Very small opening, and so overcoming the greatest diflcultyheretofore found in the manufacture of these cylindrical castings.

.What I claim as my invention, and desire to secure by Letters Patent,iszl. A core support or brace having a bearing for the core bar, an armextending out therefrom and asemi-circularor curved bar formed only onone side of said arm, substantially as and for the purposes set forth.

2. A core support or brace having a-bearing for the core bar, an armextending outtherefrom, and connected to acurved bar, said arm having awedge thereon adapted to engage with the core bar and hold the supportor brace in position, substantially as and for the purposes set forth.

3. The combination of a hollow perforated core bar, a support or bracehaving a bearing on said hollow bar, and an arm extending out therefromand connected to a semi-circular or curved bar, substantially as and forthe purposes set forth.

In testimony whereof I, the said JOHN VAL- ENTINE SMITH, have hereuntoset my hand.

JOHN VALENTINE SMITH.

Witnesses:

LEWIS MoMULLuN, J. N. Cooxn.

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